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mod_http_oauth2/mod_http_oauth2.lua @ 5188:7c531137a553
mod_http_oauth2: Implement OOB special redirect URI in code flow
Aka "copy and paste this into your client"
author | Kim Alvefur <zash@zash.se> |
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date | Thu, 02 Mar 2023 23:59:09 +0100 |
parent | 5187:6a3c1febd7be |
child | 5189:4ee8eb1134a8 |
rev | line source |
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1 local hashes = require "util.hashes"; |
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2 local cache = require "util.cache"; |
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3 local http = require "util.http"; |
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4 local jid = require "util.jid"; |
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5 local json = require "util.json"; |
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6 local usermanager = require "core.usermanager"; |
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7 local errors = require "util.error"; |
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8 local url = require "socket.url"; |
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9 local uuid = require "util.uuid"; |
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10 local encodings = require "util.encodings"; |
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11 local base64 = encodings.base64; |
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12 |
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13 local tokens = module:depends("tokenauth"); |
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14 |
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15 local clients = module:open_store("oauth2_clients", "map"); |
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16 |
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17 local function filter_scopes(username, host, requested_scope_string) |
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18 if host ~= module.host then |
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19 return usermanager.get_jid_role(username.."@"..host, module.host).name; |
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20 end |
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21 |
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22 if requested_scope_string then -- Specific role requested |
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23 -- TODO: The requested scope string is technically a space-delimited list |
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24 -- of scopes, but for simplicity we're mapping this slot to role names. |
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25 if usermanager.user_can_assume_role(username, module.host, requested_scope_string) then |
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26 return requested_scope_string; |
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27 end |
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28 end |
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29 |
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30 return usermanager.get_user_role(username, module.host).name; |
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31 end |
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32 |
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33 local function code_expires_in(code) |
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34 return os.difftime(os.time(), code.issued); |
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35 end |
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36 |
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37 local function code_expired(code) |
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38 return code_expires_in(code) > 120; |
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39 end |
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40 |
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41 local codes = cache.new(10000, function (_, code) |
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42 return code_expired(code) |
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43 end); |
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44 |
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45 module:add_timer(900, function() |
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46 local k, code = codes:tail(); |
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47 while code and code_expired(code) do |
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48 codes:set(k, nil); |
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49 k, code = codes:tail(); |
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50 end |
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51 return code and code_expires_in(code) + 1 or 900; |
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52 end) |
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53 |
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54 local function oauth_error(err_name, err_desc) |
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55 return errors.new({ |
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56 type = "modify"; |
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57 condition = "bad-request"; |
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58 code = err_name == "invalid_client" and 401 or 400; |
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59 text = err_desc and (err_name..": "..err_desc) or err_name; |
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60 extra = { oauth2_response = { error = err_name, error_description = err_desc } }; |
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61 }); |
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62 end |
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63 |
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64 local function new_access_token(token_jid, scope, ttl) |
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65 local token = tokens.create_jid_token(token_jid, token_jid, scope, ttl, nil, "oauth2"); |
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66 return { |
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67 token_type = "bearer"; |
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68 access_token = token; |
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69 expires_in = ttl; |
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70 scope = scope; |
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71 -- TODO: include refresh_token when implemented |
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72 }; |
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73 end |
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74 |
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75 local grant_type_handlers = {}; |
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76 local response_type_handlers = {}; |
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77 |
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78 function grant_type_handlers.password(params) |
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79 local request_jid = assert(params.username, oauth_error("invalid_request", "missing 'username' (JID)")); |
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80 local request_password = assert(params.password, oauth_error("invalid_request", "missing 'password'")); |
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81 local request_username, request_host, request_resource = jid.prepped_split(request_jid); |
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82 |
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83 if not (request_username and request_host) or request_host ~= module.host then |
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84 return oauth_error("invalid_request", "invalid JID"); |
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85 end |
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86 if not usermanager.test_password(request_username, request_host, request_password) then |
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87 return oauth_error("invalid_grant", "incorrect credentials"); |
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88 end |
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89 |
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90 local granted_jid = jid.join(request_username, request_host, request_resource); |
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91 local granted_scopes = filter_scopes(request_username, request_host, params.scope); |
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92 return json.encode(new_access_token(granted_jid, granted_scopes, nil)); |
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93 end |
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94 |
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95 -- TODO response_type_handlers have some common boilerplate code, refactor? |
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96 |
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97 function response_type_handlers.code(params, granted_jid) |
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98 if not params.client_id then return oauth_error("invalid_request", "missing 'client_id'"); end |
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99 |
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100 local client_owner, client_host, client_id = jid.prepped_split(params.client_id); |
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101 if client_host ~= module.host then |
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102 return oauth_error("invalid_client", "incorrect credentials"); |
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103 end |
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104 local client, err = clients:get(client_owner, client_id); |
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105 if err then error(err); end |
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106 if not client then |
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107 return oauth_error("invalid_client", "incorrect credentials"); |
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108 end |
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109 |
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110 local granted_scopes = filter_scopes(client_owner, client_host, params.scope); |
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111 |
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112 local code = uuid.generate(); |
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113 local ok = codes:set(params.client_id .. "#" .. code, { |
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114 issued = os.time(); |
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115 granted_jid = granted_jid; |
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116 granted_scopes = granted_scopes; |
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117 }); |
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118 if not ok then |
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119 return {status_code = 429}; |
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120 end |
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121 |
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122 local redirect_uri = params.redirect_uri or client.redirect_uri; |
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123 if redirect_uri == "urn:ietf:wg:oauth:2.0:oob" then |
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124 -- TODO some nicer template page |
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125 local response = { status_code = 200; headers = { content_type = "text/plain" } } |
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126 response.body = module:context("*"):fire_event("http-message", { |
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127 response = response; |
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128 title = "Your authorization code"; |
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129 message = "Here's your authorization code, copy and paste it into your app:"; |
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130 extra = code; |
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131 }) or ("Here's your authorization code:\n%s\n"):format(code); |
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132 end |
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133 |
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134 local redirect = url.parse(redirect_uri); |
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135 |
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136 local query = http.formdecode(redirect.query or ""); |
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137 if type(query) ~= "table" then query = {}; end |
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138 table.insert(query, { name = "code", value = code }) |
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139 if params.state then |
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140 table.insert(query, { name = "state", value = params.state }); |
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141 end |
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142 redirect.query = http.formencode(query); |
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143 |
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144 return { |
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145 status_code = 302; |
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146 headers = { |
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147 location = url.build(redirect); |
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148 }; |
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149 } |
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150 end |
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151 |
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152 -- Implicit flow |
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153 function response_type_handlers.token(params, granted_jid) |
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154 if not params.client_id then return oauth_error("invalid_request", "missing 'client_id'"); end |
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155 |
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156 local client_owner, client_host, client_id = jid.prepped_split(params.client_id); |
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157 if client_host ~= module.host then |
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158 return oauth_error("invalid_client", "incorrect credentials"); |
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159 end |
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160 local client, err = clients:get(client_owner, client_id); |
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161 if err then error(err); end |
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162 if not client then |
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163 return oauth_error("invalid_client", "incorrect credentials"); |
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164 end |
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165 |
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166 local granted_scopes = filter_scopes(client_owner, client_host, params.scope); |
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167 local token_info = new_access_token(granted_jid, granted_scopes, nil); |
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168 |
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169 local redirect = url.parse(client.redirect_uri); |
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170 token_info.state = params.state; |
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171 redirect.fragment = http.formencode(token_info); |
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|
172 |
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173 return { |
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174 status_code = 302; |
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|
175 headers = { |
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176 location = url.build(redirect); |
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|
177 }; |
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|
178 } |
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|
179 end |
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|
180 |
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|
181 local pepper = module:get_option_string("oauth2_client_pepper", ""); |
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182 |
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|
183 local function verify_secret(stored, salt, i, secret) |
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184 return base64.decode(stored) == hashes.pbkdf2_hmac_sha256(secret, salt .. pepper, i); |
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|
185 end |
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|
186 |
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187 function grant_type_handlers.authorization_code(params) |
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188 if not params.client_id then return oauth_error("invalid_request", "missing 'client_id'"); end |
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189 if not params.client_secret then return oauth_error("invalid_request", "missing 'client_secret'"); end |
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|
190 if not params.code then return oauth_error("invalid_request", "missing 'code'"); end |
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191 if params.scope and params.scope ~= "" then |
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|
192 return oauth_error("invalid_scope", "unknown scope requested"); |
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193 end |
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|
194 |
4260
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|
195 local client_owner, client_host, client_id = jid.prepped_split(params.client_id); |
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196 if client_host ~= module.host then |
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|
197 module:log("debug", "%q ~= %q", client_host, module.host); |
4256
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198 return oauth_error("invalid_client", "incorrect credentials"); |
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199 end |
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|
200 local client, err = clients:get(client_owner, client_id); |
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201 if err then error(err); end |
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|
202 if not client or not verify_secret(client.secret_hash, client.salt, client.iteration_count, params.client_secret) then |
4260
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|
203 module:log("debug", "client_secret mismatch"); |
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204 return oauth_error("invalid_client", "incorrect credentials"); |
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|
205 end |
4271
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|
206 local code, err = codes:get(params.client_id .. "#" .. params.code); |
4256
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|
207 if err then error(err); end |
4269
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|
208 if not code or type(code) ~= "table" or code_expired(code) then |
4260
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|
209 module:log("debug", "authorization_code invalid or expired: %q", code); |
4256
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|
210 return oauth_error("invalid_client", "incorrect credentials"); |
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|
211 end |
5181
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diff
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|
212 assert(codes:set(client_id .. "#" .. params.code, nil)); |
4256
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|
213 |
4340
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|
214 return json.encode(new_access_token(code.granted_jid, code.granted_scopes, nil)); |
4256
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|
215 end |
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|
216 |
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217 local function check_credentials(request, allow_token) |
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218 local auth_type, auth_data = string.match(request.headers.authorization, "^(%S+)%s(.+)$"); |
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219 |
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220 if auth_type == "Basic" then |
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221 local creds = base64.decode(auth_data); |
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222 if not creds then return false; end |
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223 local username, password = string.match(creds, "^([^:]+):(.*)$"); |
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224 if not username then return false; end |
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225 username, password = encodings.stringprep.nodeprep(username), encodings.stringprep.saslprep(password); |
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226 if not username then return false; end |
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227 if not usermanager.test_password(username, module.host, password) then |
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228 return false; |
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229 end |
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230 return username; |
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231 elseif auth_type == "Bearer" and allow_token then |
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232 local token_info = tokens.get_token_info(auth_data); |
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233 if not token_info or not token_info.session or token_info.session.host ~= module.host then |
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234 return false; |
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235 end |
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236 return token_info.session.username; |
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237 end |
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238 return nil; |
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239 end |
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240 |
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241 if module:get_host_type() == "component" then |
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242 local component_secret = assert(module:get_option_string("component_secret"), "'component_secret' is a required setting when loaded on a Component"); |
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243 |
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244 function grant_type_handlers.password(params) |
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245 local request_jid = assert(params.username, oauth_error("invalid_request", "missing 'username' (JID)")); |
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246 local request_password = assert(params.password, oauth_error("invalid_request", "missing 'password'")); |
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247 local request_username, request_host, request_resource = jid.prepped_split(request_jid); |
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248 if params.scope then |
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249 return oauth_error("invalid_scope", "unknown scope requested"); |
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250 end |
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251 if not request_host or request_host ~= module.host then |
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252 return oauth_error("invalid_request", "invalid JID"); |
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253 end |
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254 if request_password == component_secret then |
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255 local granted_jid = jid.join(request_username, request_host, request_resource); |
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256 return json.encode(new_access_token(granted_jid, nil, nil)); |
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257 end |
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258 return oauth_error("invalid_grant", "incorrect credentials"); |
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259 end |
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260 |
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261 -- TODO How would this make sense with components? |
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262 -- Have an admin authenticate maybe? |
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263 response_type_handlers.code = nil; |
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264 response_type_handlers.token = nil; |
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265 grant_type_handlers.authorization_code = nil; |
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266 check_credentials = function () return false end |
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267 end |
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268 |
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269 local allowed_grant_type_handlers = module:get_option_set("allowed_oauth2_grant_types", {"authorization_code", "password"}) |
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270 for handler_type in pairs(grant_type_handlers) do |
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271 if not allowed_grant_type_handlers:contains(handler_type) then |
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272 grant_type_handlers[handler_type] = nil; |
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273 end |
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274 end |
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275 |
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276 -- "token" aka implicit flow is considered insecure |
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277 local allowed_response_type_handlers = module:get_option_set("allowed_oauth2_response_types", {"code"}) |
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278 for handler_type in pairs(allowed_response_type_handlers) do |
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279 if not allowed_grant_type_handlers:contains(handler_type) then |
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280 grant_type_handlers[handler_type] = nil; |
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281 end |
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282 end |
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283 |
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284 function handle_token_grant(event) |
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285 event.response.headers.content_type = "application/json"; |
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286 local params = http.formdecode(event.request.body); |
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287 if not params then |
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288 return oauth_error("invalid_request"); |
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289 end |
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290 local grant_type = params.grant_type |
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291 local grant_handler = grant_type_handlers[grant_type]; |
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292 if not grant_handler then |
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293 return oauth_error("unsupported_grant_type"); |
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294 end |
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295 return grant_handler(params); |
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296 end |
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297 |
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298 local function handle_authorization_request(event) |
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299 local request, response = event.request, event.response; |
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300 if not request.headers.authorization then |
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301 response.headers.www_authenticate = string.format("Basic realm=%q", module.host.."/"..module.name); |
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302 return 401; |
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303 end |
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304 local user = check_credentials(request); |
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305 if not user then |
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306 return 401; |
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307 end |
4265 | 308 -- TODO ask user for consent here |
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309 if not request.url.query then |
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310 response.headers.content_type = "application/json"; |
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311 return oauth_error("invalid_request"); |
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312 end |
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313 local params = http.formdecode(request.url.query); |
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314 if not params then |
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315 return oauth_error("invalid_request"); |
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316 end |
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317 local response_type = params.response_type; |
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318 local response_handler = response_type_handlers[response_type]; |
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319 if not response_handler then |
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320 response.headers.content_type = "application/json"; |
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321 return oauth_error("unsupported_response_type"); |
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322 end |
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323 return response_handler(params, jid.join(user, module.host)); |
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324 end |
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325 |
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326 local function handle_revocation_request(event) |
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327 local request, response = event.request, event.response; |
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328 if not request.headers.authorization then |
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329 response.headers.www_authenticate = string.format("Basic realm=%q", module.host.."/"..module.name); |
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330 return 401; |
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331 elseif request.headers.content_type ~= "application/x-www-form-urlencoded" |
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332 or not request.body or request.body == "" then |
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333 return 400; |
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334 end |
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335 local user = check_credentials(request, true); |
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336 if not user then |
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337 return 401; |
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338 end |
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339 |
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340 local form_data = http.formdecode(event.request.body); |
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341 if not form_data or not form_data.token then |
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342 return 400; |
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343 end |
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344 local ok, err = tokens.revoke_token(form_data.token); |
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345 if not ok then |
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346 module:log("warn", "Unable to revoke token: %s", tostring(err)); |
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347 return 500; |
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348 end |
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349 return 200; |
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350 end |
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351 |
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352 module:depends("http"); |
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353 module:provides("http", { |
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354 route = { |
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355 ["POST /token"] = handle_token_grant; |
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356 ["GET /authorize"] = handle_authorization_request; |
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357 ["POST /revoke"] = handle_revocation_request; |
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358 }; |
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359 }); |
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360 |
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361 local http_server = require "net.http.server"; |
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362 |
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363 module:hook_object_event(http_server, "http-error", function (event) |
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364 local oauth2_response = event.error and event.error.extra and event.error.extra.oauth2_response; |
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365 if not oauth2_response then |
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366 return; |
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367 end |
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368 event.response.headers.content_type = "application/json"; |
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369 event.response.status_code = event.error.code or 400; |
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370 return json.encode(oauth2_response); |
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371 end, 5); |